Here are the conclusions, if you don't have 2 hours to spare:
1. Most people had problems with the installer, which can be put into 3 categories: - most important and complained about issue
1) No tool to partition inside the installer, like with other distros, you have to use GParted. Also installer doesn't detect changes in partitioning you made in that session, you have to reboot.
2) If you have a few drives, you can't choose 1 and have automatic options for it, so e.g. I choose drive which has Ubuntu on it and I want to see an automatic option to install alongside or a fresh install. If I have a few drives I have to disable all other ones, boot into LiveCD and then I get the correct option.
3) It detects only your first EFI partition. Known problem, still annoying.
2. Lack of software:
1) As usual everybody is complaining, but most don't mention what's missing, and nobody mentioned package request on dev.getsol.us, only one person that you can contact the devs about it.
2) Not Snap/Flatpak support in the SC. I know it's in the works, but people want that.
3) Third Party didn't work for anybody, you should either fix it, or remove it from the SC and add a link to instruction how to do it via command line.
3. Solus doesn't live well with others
1) If you try to install other system alongside it, Solus' boot entry is gone
2) No GRUB in the UEFI, not only it doesn't install it, it isn't detected by other systems.
4. Minor ones
1) Some software like Firefox not in their newest versions
2) Lack of themes (less flat) preinstalled
3) Booting to the black screen with Nvidia GPU
The positive surprise was how positive Alan Pope was about Solus, if not for him saving the day, this episode would had been very negative.
And to add, I encountered most of those problems myself, especially 1. and 3.